Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Crontab UI - Easy and safe way to manage your crontab file
HTTP Toolkit - Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.
Scheduled tasks - GNOME GUI for configuring a users' cron (automatic jobs). Some of its features are:
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
024h Lucky Reminder - 024h Lucky Reminder is a reminder software for home and office.